Ballpoint pen



FIG. 1 is a front elevational view of a ballpoint pen showing our new design;

FIG. 2 is a back view of thereof;

FIG. 3 is a left side elevational view of thereof;

FIG. 4 is a right side elevational view thereof;

FIG. 5 is a top view thereof;

FIG. 6 is a bottom view thereof;

FIG. 7 is a perspective view thereof; and,

FIG. 8 is a front elevational view pen shown separately without the cap for convenience, the back top and bottom views being the same as the front view.

The stippling shown on the ball point pen represents shading and forms no part of the claimed design. 

The ornamental design for a ballpoint pen, as shown and described. 